Rotary pump



F. NEIBEL ROTARY PUMP Dec. 10, 1935.

2 Sheets-Sheet 1 Filed March 15, 1955 Faz Nebe/ F. NEBEL ROTARY PUMPDec. l0, 1.935.

2 sheets-Sheet 2 Filed MaIGh 15, 1933 Franz Nebe/ /N VENTO/ PatentedDec. l0, 1935 UNITED STATES PATENT OFFICE ROTARY PUMP Franz Nebel,Vienna, Austria Application March 15, 1933, Serial No. 660,828 InAustria March 22, 1932 1 Claim. (Cl. 103-123) This invention relates torotary pumps of the vention are shown by way of example in the actype inwhich therev are one or more tapered companying drawings, in which:conveyor chambers which are formed between Fig. 1 shows in verticalsection a` pump in acthe casing wall, on the one side, and asubstancordance with the invention.

5 tially radially directed surface on the rotor and Fig. 2 shows in partsection and in part ele- 5 a surface on the latter obliquely inclinedtowards vation another form of pump in accordance with the casing wall,on the other side. the invention.

Rotary piston pumps of this type, are suit- Referring to the drawings,the pump consists able only for the conveyance of liquid matter, in themain -of the following parts: pump casbut do not permit of theconveyance of viscous ing l, rotary piston wheel or rotor 2, rotaryfeed- 10 to pulpy matter such as mud, slurry, dough, coner 5, bailleslide 3, baille spring 4, yielding ap 6 crete or other matter intermixedwith stones. with spring 1, and hopper 8.

The present invention has for its object to The mode of operation is asfollows: The matprovide a pump of the nature indicated which ter to bepumped is placed in the hopper 8, and shall be capable of conveying notonly liquid iS 111mg into the Dump Casing by the action 15 matter butalso thick, heavily owing matter of the rotary or centrifugal feeder 5,so that intermingled with stones. Broadly, this object the spacesbetween the impelling projections 9 is achieved, in accordance with theinvention, on the rotor 2 are lled out as completely as by thearrangement that the conveyor chambers possible. The direction ofrotation of the rotor of the pump are tapered out or expanded in a iSindicated by the GIIOW il lIl the drawings, and 20 direction opposite tothe direction of rotation of is also implied by the fact that theconveyor the rotor, and are terminated at their rear end chambers of therotor 2 are tapered-in in the by a piston-like pressing surface which isdisdirection of rotation of the rotor and taperedposed substantieuyradially to the rotor body. out in the opposite direction, andterminated by 20 Further features of the invention comprise the theSubstantially radially disposed driving or provision at the end of thehopper of a rotary Dressing Surfaces 0f 'the impelling projections 9feeder adapted to rotate in the opposite direcon the rotor 2, so thatthese surfaces act in the tion to the rotor and to feed the matter intomanner of pistons to force the matter forward. the conveyor chambers,and also the provision, In view of the fact that the conveyor chambersbeyond the rotary feeder, of a yielding member, are expanded or widenedin a direction oppofor example a spring-laden flap or the like, whichsite that of rotation, stones or the like contained prevents stones orthe like contained in the matin the matter pumped can not become clampedter to be pumped from becoming jammed at this 0r jammed between thecasing wall and the inpoint. clined surfaces of the rotor. The matteracted The pump according to the present invention is upon by theimpelling projections 9 on the rotor distinguishable from known pumpsintended for 21s then forced forward into the discharge branch theconveyance of thick or pulpy matter and h-av- I0 and thence into thedelivery pipe I I. In order ing rotary piston surfaces obliquelyinclined to that the matter shall in fact be able to pass into thecasing wall in a direction opposite to that the discharge branch l0, theend 0f the Wall 0f of the rotation. The distinction consists in thatthis discharge branch l0 adjoining the rotor is instead of the obliquerotary piston surface being formed by d baille Slide 3 Which 1S attachedt0 adjacent to a surface which extends to the casing a rocking lever I2mounted outside the casing wall and which forms an acute angle there- 0fthe Dump. and Which 1S acted UDOII by a with, increasing the danger ofjamming in the spring 4 and projects, through packing, into the conveyorchambers, in the pump according tov interior of the casing. The end ofthe bafile slide the present invention the obliquely disposed sur- 3bears, in consequence of the action of the face of each rotorcompartment is adjacent to spring 4, against the outer surface of therotor a surface which is substantially radially disposed, 2, and iscaused to ride over the impelling proand which is perpendicular orapproximately perjections 9 as the rotor revolves. It is forced up U0pendicular to the tangent to the casing Wall. This against the spring Iby the steep face of the 50 radial surface thus constitutes a pressingsurface said impellers and pressed down again after travwhich acts inthe manner of a piston upon the ersing the highest point, by the actionof this matter pumped, so that the possibility of jamspring. This cycleis repeated during the pasming is effectually eliminated. sage of .eachof the impelling projections 9, so Two forms of construction embodyingthe inthat the baille slide 3 prevents the matter from rotor 2.

becoming forced from the deliveryto the suction-side of the pump, andcompels the same to pass on into the discharge branch I0. The rocking ofthe baille slide I about its axis oi oscillation I3 is renderedpossible, in spite of the apparently unfavorable directions of drive, bythe fact that favorable rotation moments are set up.

The ap 6 is serrated on its inner surface I4, and is adapted to yieldagainst the action of the spring l. so that it eiiectually eliminatesthe possibility of the clamping or jamming of larger stones in thematter to bepumped.

In the form of construction shown in Fig. 2, which is intended moreparticularly for snow clearing, the casing I is attached by means of abolt I5 to the front end of the chassis I6 of a vehicle, and is providedwith a hopper I1 which is so disposed that when the vehicle travels inthe direction of the arrow c the matter to be pumped is driven by thehopper straight on to the rotor 2, so that it fills the conveyorchambers automatically, and is thence forced into the riser II fromwhich it is nally laterally discharged. For the purpose of rejectinglarger stones and the like there is provided in the casing I a roller Ilwhich is caused to revolve in the same direction as the About the axisof the roller I8 there is arranged to rock on an arm I! a plate 20 whichbears of its own weight upon the road surface to be cleared. In order topermit of the circumvention of obstacles, such as projecting cobblestones, the said plate is provided on one side with a thrust rod 2Iwhich is eccentricaly attached to a drum 22 upon which a tensile member,such as a cord 23, is adapted to be wound, thereby lifting the plate 20over the obstacle. when this plate 5 is arrested relatively to thevehicle, since in this case the thrust rod 2l rotates the drum 22. Theplate 20 receives the matter to be pumped lying upon the roadway andconducts the same over the upper outer surface or the arm I9, to the 1orotor 2'. i

I claim:

In a rotary piston pump for viscous material, a substantiallycylindrical casing having an inlet and an outlet opening through itsperipheral l5 wall, a rotor in said casing having a plurality of radialsurfaces, the outer end of each radial surface being connected to theinner end of the succeeding radial surface, whereby there are formedbetween the casing and the periphery of the rotor 20 a plurality ofconveyor chambers which taper in the direction of rotation of the rotor,and a baie slide mounted to oscillate about a point outside the casingand having a portion .spring urged into casing and into contact with therotor periphery, 25 said baille portion separating the casing inlet fromthe outlet and being formed as an extension of that wall of the outletwhich is anterior with respect to the direction of rotation.

` FRANZ NEBEL.

